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LM9074M
Low-Dropout System Voltage Regulator with Keep-Alive ON/OFF Control
LM9074
System Voltage Regulator with Keep-Alive ON/OFF
Control
General DescriptionThe LM9074isa 5V, 3% accurate, 180 mA NPN voltage
regulator. The regulator featuresan active low delayed reset
output flag which canbe usedto reseta microprocessor
systemon turn-ON andinthe event thatthe regulator output
falls outof regulationfor any reason.An external capacitor
programsa delay time interval before the reset output can
return high.
Designedfor automotive application the LM9074 containsa
varietyof protection features suchas reverse battery, over-
voltage shutdown, thermal shutdown, input transient protec-
tion anda wide operating temperature range. unique two-input logic control schemeis usedto enableor
disable the regulator output.An ON/OFF input canbe pro-
videdbyan ignition switch derived signal whilea second,
Keep-Alive input,is generatedbya system controller. This
allowsfora systemto remain ON after ignition has been
switched OFF. The system controller can then executea
power-down routine and after which commandthe regulator
OFFtoa low quiescent current state (60µA max).
Design techniques have been employedto allow the regu-
latorto remain operational and not generate false reset
signals when subjectedto high levelsofRF energy (300V/m
from2 MHzto 400 MHz).
Features Automotive application reliability 3% output voltage tolerance Insensitiveto radiated RFI Dropout voltage less than 2.5V with 180mA output
current Externally programmed reset delay interval Keep-alive feature with2 logic control inputs +40V Load dump transient protection Thermal shutdown Short circuit protection and disable safety features Reverse battery protection Low OFF quiescent current, 60µA maximum Wide operating temperature range −40˚Cto +125˚C
Connection Diagram and Ordering Information (Top View)
14-PinSO PackageOrder Number LM9074M
SeeNS Package Number M14A
February 2005
LM9074
System
oltage
Regulator
with
Keep-Alive
ON/OFF
Control
